Shuttle tension



SHUTTLE TENSION Filed April 19, i955 INVENTOR, 'o'Zu/ardao m,

Patented Oct. 8, 1935 UNITED STATES PATENT OFFICE 1 Claim.

The filling tension mechanism usually employed in shuttles in which silk or artificial silk is used has heretofore comprised a row of xed pins driven into the shuttle body from the tcp 5 and a spring-resisted lever having eyelets to alternate with these pins when the filling, trained back and forth zig-zag fashion with respect to the pins and eyelets, was under draft, as in the flight of the shuttle. These pins work out so as to project from the shuttle and become a dangerous menace to the warp. One object of my invention is to provide a shuttle with a tension mechanism in which these pins will be dispensed with. Another object is to provide a shuttle tension mechanism which shall preserve the desired tension on the filling without unduly chafing or wearing the same and with as little Wear of the filling engaged parts of said mechanism as possible and which tension shall be as nearly equable as possible during the flight of the shuttle. In carrying out this object I employ two cooperative tension means, to wit, a primary one which includes a spring and thereby tends to hold the yarn with a bend therein and yields 223 on a pull on the yarn and a secondary one which frctionally resists slippage of the yarn lengthwise of itself, the resistance of the primary one being less than that of the secondary one so that whereas the full tension is mainly dependent on the slip-friction of the secondary one the yarn gradually assumes the state of full tension when the shuttle starts on its flight.

In the drawing,

Fig. l is a horizontal fragmentary sectional view of a shuttle embodying the improved tension mechanism;

Fig. 2 is a side elevation thereof; and

Fig. 3 is a plan, partly in section, illustrating a modification.

The shuttle body i has the usual cavity 2 for the quill 3 or other core for the wound weft package and forward of said cavity an opening 4 is formed which extends clear through the body from side to side, the cavity and opening having communication with each other through an eyelet 5.

In the opening is arranged the mentioned primary tension means, to Wit, one which includes a spring and tends to hold the yarn with a bend therein and yields on a pull on the yarn, the same comprising a yielding member having a thread eyelet or eyelets, a spring yieldingly opposing its movement and means to confine it to movement in a definite path. Said member is here a slide in the form of a block 6 having eyelets 'I for the thread and movable back and forth generally lengthwise of the shuttle. The means to confine said member to movement in a definite path-here rectilinear-is a pin 8 which is entered to opening 4 from the near side in Fig. 5 1 and has one end seated in a hole 9 in the shuttle body and its other end provided with an eye 8a penetrated by a device I0 which is here a screw screwed into the shuttle body from the top thereof. (Instead of pin 8 having an eye to 10 receive the screw, it may have a hook Bb, as in Fig. 3). The spring is shown at I I, being coiled about the pin and having one end clamped between two annular shoulders 8c thereof and its other end entered into the member 6. The spring 15 exerts no torsional action on member 6, which in any event is kept from turning on the pin by having its flat top and bottom faces closely related to the top and bottom surfaces of opening 4, as shown in Fig. 2. Thus the fixed structure 20 of the shuttle, including the guide, confines the slide against all angular displacement.

The weft or filling a, extending through eyelet 5, reaches through the eyelets 1 of member 6 and then back to the eyelet outlet I2 of the 25 shuttle body, being normally thus maintained in a bend by the action of the spring to urge said member forward against the front surface of opening 4.

In the front end of cavity 2 is the mentioned 30 secondary tension means which frictionally resists slippage of the yarn lengthwise of itself, being here and preferably immovable lengthwise of the yarn. It is in effect a clamp. In the example, one member of this clamp is fixed and 35 consists of a U-shaped metal strip I3 which straddles a portion la of the shuttle body formed to project into the cavity from one side thereof. The other member is a U-shaped strip I4 arranged with its convex side facing the convex 40 side of the member I3 and slidable toward and from saidmember on a pin I5 driven into the side of the shuttle body and into projection I a, penetrating member I3, member I4 being kept from turning on pin I5 by bearing against the 45 bottom of the cavity. The clamping pressure may be obtained by any elastic means acting on member I4, but I prefer for this purpose to interpose a piece of sponge rubber I i5 between member I4 and the outer side of the cavity, it 50 being kept in place by being arranged under pin I5.

The filling a, between the quill 3 and eyelet 5, extends between the brake members of the secondary tension means. 55

The principal tension means is what I have termed the secondary one in that it resists to a greater degree and more steadily the slippage 0i the lling during the iiight of the shuttle than the primary tension means, which latter acts initially, or when the shuttle starts its flight, to cause the ultimate degree of tension to be assumed gradually and which also acts upon the shuttle coming more or less quickly to rest at the end of its iight as a take-up for the iilling, so that the latter is then kept taut. To these ends it is desirable that the parts of the two means be arranged so that the filling extends substantially straight from the endwise-delivery package to the guiding medium (eyelets l) of the primary means and that the movability with respect to the latter means be as nearly as possible lengthwise of this substantiallyV straightY portion of the lling.

When the eyelets 1 become worn the member 6 can be removed and replaced with a new'one or provided with new eyelets by removing screw I0 and withdrawing pin 8. The strips I3--l4 oi the secondary tension means can also be removed and replaced, if they become worn, by removing pin or screw I5.

Having thus fully described my invention what I claim is: y

In combination, a shuttle body having an opening at one Yside thereof and a hole reaching from said opening, said body also having a lling outlet, a wound package in said body, a pin in said opening having one end entered into the hole, a filling guiding and tensioning member slidable on the pin and normally maintaining a bend in the filling between the package and 15 outlet, a spring resisting movement of said member in the direction to straighten said bend, and removable means engaging the pin and retaining it in the hole.

EDWARD BLOQM. 

